Is rheumatic fever something like sepsis?

Autoimmune: Rheumatic fever is a sequels of untreated streptococcal throat infection. Body produces antibodies to the bacteria which can attack joints and heart valves as they share some protein structures with the bacteria.

Quite different: In sepsis living germs are circulating in your blood, triggering changes in blood pressure and attacking your organ systems. In rheumatic fever, antibodies created by your own immune system long after a strep A illness begin attacking various organ systems. (Heart,brain,kidney). The only similarity is you are quite sick.